Ext temp sensor problems
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
It is the outside air temperature (OAT) sensor. New one is GM part number 10248414 ... GM list price is $10.89 ... so not exactly a budget breaker.
If you want to test it before replacing it ... from another post .....
Disconnect the sensor. You should get DTC B0333 Outside Air Temp Sensor Open, and the temp display should default to 65*F. This would tell you that there are no shorts in the wiring harness/connector.
Short the sensor connector - this won't blow anything. You should get DTC B0332 Outside Air Temp Sensor Short to Ground, and the temp display should default to 65*F. This will confirm that there are no random impedances in the circuit.
Measure the impedance of the sensor itself. At 68*F, it should measure 12,493 ohms. At 86*F/8,056 ohms, 104*F/5327 ohms. That should be enough to verify it's within its expected range
The sensor is located in the engine compartment .... it is attached to the frame rail on the passenger side almost directly below the headlights.
Also ... IMPORTANT .... You need to drive the car after you replace the sensor for AT LEAST 2 minutes for the system to read the new sensor. Otherwise, after you replace the sensor the temperature displayed, until you drive for a few minutes, is what was "in memory" when the engine last shut off.
If you want to test it before replacing it ... from another post .....
Disconnect the sensor. You should get DTC B0333 Outside Air Temp Sensor Open, and the temp display should default to 65*F. This would tell you that there are no shorts in the wiring harness/connector.
Short the sensor connector - this won't blow anything. You should get DTC B0332 Outside Air Temp Sensor Short to Ground, and the temp display should default to 65*F. This will confirm that there are no random impedances in the circuit.
Measure the impedance of the sensor itself. At 68*F, it should measure 12,493 ohms. At 86*F/8,056 ohms, 104*F/5327 ohms. That should be enough to verify it's within its expected range
The sensor is located in the engine compartment .... it is attached to the frame rail on the passenger side almost directly below the headlights.
Also ... IMPORTANT .... You need to drive the car after you replace the sensor for AT LEAST 2 minutes for the system to read the new sensor. Otherwise, after you replace the sensor the temperature displayed, until you drive for a few minutes, is what was "in memory" when the engine last shut off.
Racer
Joined: Feb 2007
Posts: 431
Likes: 5
From: Chico CA
Black Z06 nailed it pretty well. It bolts to the top of the right frame rail, with the bulb protruding through the plastic radiator shroud.
If you put one of the screens on the bottom nose of the car (to keep trash out of your rad), you may need to cut out a bit to get it away from the sensor bulb. I didn't, and it took out the original sensor.
That said, it's less than a ten minute job if you're at all handy.
If you put one of the screens on the bottom nose of the car (to keep trash out of your rad), you may need to cut out a bit to get it away from the sensor bulb. I didn't, and it took out the original sensor.
That said, it's less than a ten minute job if you're at all handy.
